Observations on the Effects of Intake-Generated Swirl and Tumble on Combustion Duration

Kent, J. C.; Mikulec, A.; Rimal, L.; Adamczyk, Andrew A.; Mueller, Stephan R.; Stein, Robert A.; Warren, Christopher C.

doi:10.4271/892096

Cited by 74 publications

(25 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Image-shifting by physically moving the camera during recording was suggested by Lourenco et al (1986) among others, and was applied by Grobel and Merzkirch (1991) to a free convection flow along a heated, vertical wall. In the present work, image-shifting was achieved by translating only the back-plane of the camera along the horizontal direction, while keeping the lenses fixed.…”

Section: Image-shiftingfor the Stereo-cameramentioning

confidence: 99%

“…The use of correlation techniques to obtain the third component of velocity distinguishes the present work from the particle-tracking stereo-camera approach used by Racca and Dewey (1988), and Kent et al (1989). Particle-tracking using two or more cameras allows the mapping of a finite volume in a flow, as opposed to a planar domain in correlation PIV.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stereoscopic particle image velocimetry applied to liquid flows

Prasad

Adrian

1993

Experiments in Fluids

282

116

View full text Add to dashboard Cite

A twin-camera stereoscopic system has been developed to extend conventional high image-density Particle Image Velocimetry (PIV) to three-dimensional vectors on planar domains. The stereoscopic velocimeter performs with extremely high accuracy. Translation tests have yielded errors (rms) of 0.2% of full-scale for the in-plane displacement, and 0.8% of full-scale for the out-of-plane component, both of which agree with the errors predicted by an uncertainty analysis. In addition, modified techniques in hardware and software have enabled the stereoscopic system to perform successfully when acquiring images through a thick liquid layer, wherein previously the aberrations arising due to the liquid-air interface have restricted the use of such systems. With these techniques, the stereoscopic system, in combination with a simple method for image-shifting, is able to accurately measure threedimensional velocity fields in liquids. This is demonstrated by measurements of the helical, three-dimensional flow induced by a rotating disk in glycerine.

show abstract

Section: Image-shiftingfor the Stereo-cameramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stereoscopic particle image velocimetry applied to liquid flows

Prasad

Adrian

1993

Experiments in Fluids

282

116

View full text Add to dashboard Cite

show abstract

“…This higher turbulence is believed to generate both faster flame-front propagation and higher reactive flame-surface area. The effect of tumble motion on reducing burning rate in a 4-valve engine has been demonstrated by Kent et al (1989). Most of the studies in the past have been focused on generating "pure swirl" and investigating its characteristics during the induction period.…”

Section: Introductionmentioning

confidence: 99%

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Khalighi

1991

Experiments in Fluids

View full text Add to dashboard Cite

The purpose of this work is to characterize the in-cylinder tumbling flow generated by an engine head during the induction process using flow visualization and particle tracking velocimetry (PTV). The study was carried out for a 4-valve engine head with shrouded intake valves in a special single cylinder transient water analog. This shrouded intake valve configuration was used to obtain a prototypical "pure tumble" flow suitable for fundamental combustion studies. The results revealed that the shrouded intake valves generate a strong, well-behaved tumble vortex on the axial plane between the cylinder head and the piston face. This vortex dominates the entire flow field and seems to be highly repeatable from cycle to cycle. The effect of engine speed on this tumbling flow was studied. An equivalent "tumble ratio" was defined and evaluated using the measured velocity fields at BDC (bottom dead center).

show abstract

“…By keeping one of the two inlet valves closed, it is possible to generate more pronounced swirl and tumble motions than those produced with both valves open, leading to higher turbulence intensities near the combustion chamber on approach to TDC of compression.2. [19][20][21] This can give rise to more rapid combustion and give significant improvements in fuel economy. For this reason the influence of port deactivation was assessed for steady flow conditions.…”

Section: Effects Of Intake Jet Direction Port Deactivation Throttlimentioning

confidence: 99%

On the Structure of Steady Flow Through Dual-Intake Engine Ports

Mahmood

Chen

Yianneskis

et al. 1996

Int. J. Numer. Meth. Fluids

View full text Add to dashboard Cite

The influence of intake port design on the flow field in a dual‐intake valve engine was investigated using computational fluid dynamics, in order to study the effect of inlet port design on the in‐cylinder flow. A detailed 3D computational grid incorporating all the features of the Ford Zetec production engine inlet ports, valves and cylinder head was initially created and the flow structure modelled at 5 and 10 mm valve lifts under steady flow conditions. Comparisons of computational results with experimental data obtained by laser Doppler anemometry indicate that the flow characteristics have been predicted well in most regions. Flow generated by different intake port designs was also simulated by introducing air into the cylinder at different directions to the inlet valve axes and the effects of port deactivation, throttling and exhaust gas recirculation were examined. The implications of the results for intake port design are discussed.

show abstract

Observations on the Effects of Intake-Generated Swirl and Tumble on Combustion Duration

Cited by 74 publications

References 8 publications

Stereoscopic particle image velocimetry applied to liquid flows

Stereoscopic particle image velocimetry applied to liquid flows

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

On the Structure of Steady Flow Through Dual-Intake Engine Ports

Contact Info

Product

Resources

About